The only time we insulate two lines is in refrigeration. Why may the liquid line need to be insulated? He said the temperatures of the refrigerant lines of a home heat pump system can be tricky but we'll get to that shortly. berkshire (Aeronautics) 12 … Problem 18RQ from Chapter 26: Why may the liquid line need to be insulated? Strapping the two together and insulating over both lines together creates a heat exchanger that pre-cools the liquid before expansion. What is considered a long line application for residential air conditioning? For Cold Water Pipes – Cold water pipes have more pressing reasons for why you need to insulate them, and has little to do with the desired temperature of your water while showering. They are warm to hot (110°F (43.3°C) for air-cooled). There is no need to insulate the smaller, warmer copper pipe, often called the liquid line, because not insulating this line allows it to shed heat which is exactly what you are trying to do with an AC system. The insulation will enable the flue to … The liquid line will follow the same route as the vapor line. Try our expert-verified textbook solutions with step-by-step explanations. If this is your first visit, be sure to Line sets for mini splits are available in multiple, corresponding sizes, with the first number indicating the diameter of the liquid line and the second number indicating the diameter of the suction line. The large-diameter line (suction line or gas line) should be insulated along its entire length. Why may the liquid line need to be insulated Liquid lines may need to be, 46 out of 62 people found this document helpful. If a duct isn’t insulated for instance, cold air that moves through the duct will gain temperature. It prevents the suction line from sweating and dripping water inside the house. If your expansion device is on the outdoor unit - as is the case on most A/C split systems, then the 'liquid line' isn't really a liquid line, it is part of the evaporator and contains low temp liquid/flash gas, and so it needs insulating to prevent it absorbing heat prior to the coil. However, when the liquid line runs through a hot space such as an attic, insulation of the liqud line may be required to prevent boiling from occurring prior to the expansion valve. The hot gas lines may need to be insulated if it is exposed to cold temperatures that could cause the refrigerant to condense in the line. We have a number of low-ambient R-410a ductless split system going in, serving 24/7 interior technical loads. Wvfan79 : I will be standing by should you have further questions. 2. P.S. Suction gas for most air conditioning processes is somewhere between 40 and 45 degrees, which is below the dew point of ambient air in most climates, particularly humid climates, that require air conditioning. The reason for the insulation is to keep it from sweating, it has not real job in the thermal loss aspect. It is always a good idea to insulate a stainless steel chimney liner. Allowing the liquid line to lose heat to the air actually improves performance by increasing subcooing. How can flash gas be spotted in a liquid line? Horizontal suction lines should slope 1/2” per 10’ toward the Wvfan79 : With the liquid line being warmer than the ambient temperature it is rejecting heat to the air. Inside the condensing unit is where you can find the high side access port if you need it. It also limits the amount of heat added to the refrigerant as it … Get solutions The suction line which carries gases from the evaporator (coils at the furnace area) back to the compressor / condenser on the exterior, should be insulated. Discharge lines are generally un-insulated. Wvfan79 : This is critical during hot, humid days, and lack of the refrigerant lines insulation often results in condensation forming up on their surface, and dripping onto the surrounding surfaces. This is why both lines are insulated and it is not a liquid line, technically it would be referred to as the condensate line. Course Hero is not sponsored or endorsed by any college or university. Liquid lines generally are insulated. If the metering device is in the outdoor unit, you're going to want to insulate the line. Liquid lines may need to be insulated if they travel through an unusually hot space. What would be, the pressure drop for a 134a system operating with a 0°F saturation, What pressure drop should the engineer use on the nomograph if the equivalent. This is a common question you might be asking yourself when you are getting ready to purchase a stainless steel chimney liner. Liquid lines generally are insulated. Now measure the length and outer diameter of the copper pipe and the thickness of the old existing insulation. The large line was insulated at install-time (and I added another layer, and a loose fitting, flexible aluminum dryer hose over … They may be also very hot, in excess of 150°F (66°C), so insulation may be warranted as a safety consideration, or if the heat loss from the discharge gas line would be considered objectionable to the space. if it is too cold, it may … length for the suction line in the above system is 75 feet? A pressure gain in the liquid line is not detrimental to the performance of the system. Older refrigerant lines might be wrapped with insulating tape in order to prevent condensation from forming on pipe surface during system operation. That causes the liquid line to sweat. the roof of a building at roof level), or if they could be considered hot enough to pose a safety risk, then insulation should be added. The liquid line (smaller/warm) should not be insulated. 83 26-19) Why might the hot gas line need to be insulated? Do I need chimney liner insulation? If liquid lines pass through a space that is warmer than the refrigerant (i.e. Normally the Manu tells you what temp difference to look for between both lines. If liquid lines pass through a space that is warmer than the refrigerant (i.e. Long runs of liquid line that are exposed to high ambient temperatures should be insulated to maintain proper sub-cooling values on the system. check out the. Health and safety first..........unless I'm in a hurry. This preview shows page 48 - 51 out of 67 pages. Low temp suction lines and all liquid lines must be insulated in all Nature’s Cooling and Enviroguard applications! so how can you use r22 rated pipes for 410 system may result in future leaks. The suction line of a refrigeration system is normally insulated with a flexible, closed-cell elastomeric material. The lines are both insulated because the metering device is actually in the outdoor section fo the unit which is a different configuration that a typical setup where the metering device is at the indoor coil, the refrigerant is cold after leaving the metering device so with no insulation on that pipe the pipe would sweat and possibly freeze up, thanks Mark.Let me know if you need more help, thanks The suction line transports refrigerant in its gaseous state, while the liquid line transports refrigerant in its liquid state. Lab Manual for Fundamentals of HVACR (2nd Edition) Edit edition. Both of these lines, when intended for mini-split HVAC units as opposed to traditional central air systems, are insulated and feature flare connections … To avoid going off topic to explain metering, I'll just say that depending on where the metering takes place, you may or may not have to insulate the "liquid" line. For instance, a small (diameter) set contains a 1/4" liquid line with a 3/8" suction line. Liquid Line Insulation. pressure gain in the liquid line vertical drop (1/2 psi per foot) may overcome the frictional pressure loss resulting in a total pressure gain. It is never below the dew point so it does not need insulation. Metering in the outdoor unit. That is a good thing. Originally Posted by frank. hi mate, i have been taught and have read that 410 works on higher pressure then other refrigerant and also it has thicker diameter pipe and special flaring tool. In today’s competitive service market, every conscientious service technician should understand why a refrigeration or air conditioning system must have the proper amount of liquid subcooling. the roof of a building at roof level), or if they could be considered hot enough to pose a safety risk, then insulation should be added. When you line your hot water pipes with insulation, it will help keep your water rocking at an optimal toasty temperature as it goes to different parts of your home. If the liquid line is insulated the insulation slows down the heat rejection, which would not be good. Get shopping advice from experts, friends and the community! Find answers and explanations to over 1.2 million textbook exercises. We do not ordinarily insulate the liquid line as this usually affords a little more condensing surface and is in the range of mild temperatures. This causes condensation and dripping water, and you will need a larger system to fulfil your cooling requirement. As for insulating lines, the liquid line is always the liquid line in a HP. List the system modifications that need to be made for a long line residential air, United States Environmental Protection Agency. They are warm to hot (110°F (43.3°C) for air-cooled). Ideally you should separate them, the large line is very cold which must be insulated to avoid condensation or water damage, also, when it goes into the compressor, the cold gas won't work the compressor too hard (or too hot). Sometimes you will see an insulated liquid line on a heat pump because you will get a little flow of refrigerant on the off cycle. The insulation performs two functions. [Editor’s Note: This is the first of a three-part series covering the importance of liquid subcooling in a refrigeration or air conditioning system.] the small liquid line is at room temp. While this is not essential it does increase energy efficiency and really costs nothing. 1 3/8” line with four 90° elbows and 1 angle valve. What is the pressure drop due to the weight of refrigerant in a 30-foot tall liquid, If the condenser pressure of the above system is 317 psig, how much, subcooling will be required to offset the pressure drop created by the vertical, According to Table 26-31 what would be the recommended support spacing for, Use Figure 26-25 to determine the refrigerant velocity through a 7/8” suction, line on a walk in cooler with a capacity of 2 tons, an evaporator saturation. Use Figure 26-13 to determine the total equivalent length of a 50 foot section of. Not only will not improve your heating efficiency, it will greatly reduce your cooling efficiency. Why might the hot gas line need to be insulated? An engineer wishes to select a suction line that will have a maximum pressure, drop which is equivalent to a 2°F saturation temperature drop. Why is that ac manufactures now a days consider having expansion tube in outside unit itself? The insulation also prevents the suction line attracting heat from the outdoors on its way to the condenser coil. Insulation also helps to reduce the noise level, absorb the vibration generated by the system, and prevent the spread of fire. It is the larger of the two lines. The smaller line carries the liquid refrigerant to coils of the evaporator in the … If your expansion device is on the outdoor unit - as is the case on most A/C split systems, then the 'liquid line' isn't really a liquid line, it is part of the evaporator and contains low temp liquid/flash gas, and so it needs insulating to prevent it absorbing heat prior to the coil. What about recommended insulation of the liquid and vapor lines for a HP that is primarily used for heating in a cold-weather area (MN). Having the large line or vapor line insulated is required. Dunwoody College of Technology • VETERINARY 395, Study Guide Commercial Refrigeration and HVACR Maintenance, Dunwoody College of Technology • CHEMISTRY 400. 3 yrs ago you had an "expert" response to an inquiry about the difference between home heat pumps and air-conditioners. Unfortunately the expert's response trailed off. Insulating the suction line is done to prevent condensate from developing and dripping off. There is NO Building Regulation that says you must insulate around a flexible flue liner, within a chimney stack.However building regulations do state that gases must be safely taken away from the building and by insulating your flexible flue liner, within the chimney cavity will ensure that the gases will travel directly up from the stove and out through the chimney top. 1. temperature of 20°F, and a condenser saturation temperature of 100°F. 'Ll get to that shortly CHEMISTRY 400: why may the liquid transports. 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